Statistical analysis : The sample size has been calculated in order to have an estimated probability of success (corresponding of primary objective) of 50% (worst case) with 95% confidence intervals of 30 to 70. The two-sample t-test (and Wilcoxon rank-sum test) is used to compare the mean changes of the variables from baseline to 10, 30 and 90 days. Finally, the Chi-square test is used to test for adverse events at the end of follow-up. P ≤ 0.05 is indicative of statistically significant.